Apparatus for mixing, sifting, and kneading



Marh 28, 19441.v P. voLLRATH 2,345,163

APPARATUS FOR MIXING, SIFTING, AND KNEADING Filed Nov. 30, 1940 3 Sheets-Sheet 1 Margh 21s,v 1944.' IP. VQLLRATH APPARATUS FOR MIXING, SIFTING, AND KNEADING Filed Nov: so, 1940 `s sheets-sheet s l l 11,11 ,l I

Patented Mar. 28, 1944 All,umani-Usl Folt- MIXING, SIFTING, AND

KNEADING Paul Vollrath,

Application November. 3o, 1940, i In 'Germany November on-rtheRhine, Germany;

n"Property Custodian SerialvNo. 368,050 30, 1939 The invention relates to an and result that a very good and thorough mixing, sifting or kneading effect is produced.

The object of the invention is to further improve the mixing effect in apparatus of this type generated by circular movements about a pluralityrofv axes. In some forms of the invention one of the circular movements is intermittent and its direction canine changed;

Means may be provided to stop either of the or the other axis; or to ments tohold the tool to a stationary axis of rotation.

I am aware that machines for Wet dressing ores are kn movements.

Several embodiments of the invention are illustrated by way of example in the. accompanying drawings, in which Fig. 1 isa ver-ticall section through a mixing apparatus,

Fig. 2 is a section on the line a-a of Fig. 1,

Figs. 3 .to 8 are diagrammatical illustrations of the forces and circulating movements of the tool,

Fig. 9 is a vertical section of another form of construction according to the invention,

Fig. 10 is a section on the line b b of Fig. 9,

Fig. 11 is a vertical section of a third modiiication,

Fig. 12 is a vertical section of a fourth modification, and

Fig. 13 a section on the line c-c of Fig. 12.

In all forms of construction of the invention the In the form of and 2 either 3U pivoted on directions.

In the form of construction shown in Fig. 9 a spur wheel 3| is arranged on the bearing sleeve I9 instead of the ratchet-wheel with pawls, said spur Wheel 3i meshing with a spurwheel 32 keyed on Ithe hinge shaft 23. ByV clutch devices not shown and of known type, the spur Wheel 32 can be coupled either with the hinge shaft 231or. with the bearing sleeve 22` of thesarne.

In the form of construction shown in- Fig. 11 the driving motor 25 is mounted on thearrn 2l and drives the hinge shaft 23. shaft 23 a drives, by means of a chain 34, a sprocket Wheel 35 keyed on the. toolshaftv the shaft l5 In the form ofconstruction shown in. Figs. 12 and` 13 the driving motorl 25 islrnounted on the bow I6` andv drives the central shaftv 2,0.

On the hinge shaft 2,3.: la hub 36;-is mounted arm |1 and upright I8 may also be employed in the other embodiments of the invention.

In all forms of construction the arms 2| and 24 may be adjustable in length and adapted to be locked by any suitable known means, it being then necessary, in so far as positively cooperating driving elements are provided, to make the same exchangeable.

The operation is diagrammatically shown by `gs. 3 to 8, which especially relate to the emlbodiment shown in Figs. 1 and 2.

Suppose the individual parts of the jib arms to be in the position shown in Fig. 3, in which the inner arm 2| and the outer arm 24 are in alignment. If then the tool turns about the axis of its shaft I5 in the direction of the arrow, a reaction eiect will be produced of the tool in the material to be mixed. Considering the hinge 23 as a fulcrum, the unequal moments of force acting perpendicularly to the arm 24, as a result of the reaction effect, will tend to swing the arm 24 in the direction of the arrow 43; whereas at the same time an oppositely directed force acts in the direction of the arrow 44 upon the hinge shaft 23. The result is rection about the hinge shaft 23 and the inner arm 2| swings in anti-clockwise direction about the central shaft 2. The individual parts of the jib arm accordingly assume the position indicated in Fig. 4, the force acting in the direction of the arrow 44 being decomposed into the two components 45y and 46 and only la smaller force tending to turn the inner arm 2| in anti-clockwise direction. When the elements assume the position shown in Fig. 5, the component 4B disappears completely and the inner arm part 2| comes to standstill, whereas the outer arm 24 continues its revolving movement in clockwise direction.

A component 41 occurs upon further rotation 24, which tends to swing the inner arm 2| in the opposite direction, i. e., in clockwise direction. However, as the locking device 28, 29, 30 only admits of a rotation in the one direction, and as this device is usually enstandstill until the position shown in Fig. '7 has been passed and then again a component 46 occurs, as shown in Fig. 8, which tends to swing the inner arm 2| in anti-clockwise direction. Therefore, while the outer arm 24 circulates continually with the mixing tool, there always occurs an interruption of the circulation of the inner arm 2|, so that this arm rotates only stepwise and, according to which one of the two pawls 29 or 30 is engaged, either in the one or the other direction. If both pawls 29 and 39 are engaged, the inner arm part 2| cannot travel in by the rotation Y any direction and the tool merely circulates about the shaft 23. Thus it is with smaller troughs also, as indicated at 48.

Exactly the same manner of operation takes place in the form of construction shown in Fig.

possible to work 11, Whereas in the forms of construction shown in Figs. 9, 12 a diierence can be noted in so far as the rotating movement produced action effect of the mixing tool is produce a planetary movement with the aid of spur wheels, so that in this instance the circular movement is a continuous one, always in the same direction and dependent on the revolving direction of the tool shaft I5. Also in the forms of construction shown in Figs. 9 and 12 a modiiication may be obtained, in that the spur wheel 32, instead of being coupled to the hinge shaft 23, is coupled with the bearing casing 22 of the same so that thereby the arm 2| remains at standstill.

Whether the drive of the tool shaft |5 takes place directly as shown in Figs. 1 and 9 or indirectly as shown in Figs. 11 and 12 does not alter the operation in the least, as in any case a reaction effect occurs by the movement of the mixing tool in the material to be mixed and has the tendency to produce a circulating movement oi the tool, whereby the movements contemplated by the new arrangement automatically take place. If the arms 2| and 24 are locked in relation to one another, the whole arrangement rotates about the central shaft 20, which under certain circumstances may be desirable; likewise the complete exclusion of a rotary movement, when the arms 2|, 24 are locked in relation to one another by locking the arm 2| to its bearing |9.

What I claim as my invention and desire to secure by Letters Patent of the United States is:

1. In an apparatus for treating material in the mass, a, support, a jib arm attached by a vertical pivot at one end to said support, a tool mounted on the opposite end of said jib arm for rotation about a vertical axis, said jibarm being composed of two parts joined by a vertical hinge, means for rotating said tool, and ratchet means for preventing rotation of said jib arm in one direction about its pivotal connection with said support, while permitting rotation thereof in the reverse direction.

2. In an apparatus for treating material in the mass, a support, a. jib arm attached by4 a` vertical pivot at one end to said support, a tool mounted on the opposite end of said jib arm for rotation about a vertical axis, said jib arm beingv composed of two parts joined by a hinge` comprising a vertical shaft iixed to the tool-bearing part of said jib arm and a bearing for said shaft on the other part of said jib arm, means for rotating said tool, the tool-bearing part of said jib arm being adapted to rotate on said hinge in response to reaction forces generated by the rotation of said tool in the material, a stationary gear concentric with the pivotal connection of said jib armto said support, and a gear meshing with said stationary gear fixed to said hinge shaft.

PAUL VOLLRATH. 

